Grinding-machine.



APPLICATION FILED Amm, 190e. s SHEETS-SHEET 1.

v ml No. 861,738. PATENTED JULY 30, 1907. A. B. LANDIS.

GRINDING MACHINE.

APPLIOATION FILED APR. e, 1906.

a SHEETS-SHEET 2.

No. 861,738. PATENTED JULY so, 1907.

A. B. LANDIS.

GRINDING MACHINE. APPLICATION FILED APB.6,1906.

I s SHEETS- SHEET s.'

@X71 humaan e @wwf Y www? f3. WM,

lsnlinluu s. Laurus, or WAYNESBORO, PENNSYLVANIA.

GRIND NG-EIAUHINE seme-s.

Specieation of Letters atent.

Patented July so, 1907.l

.Application and Apru 6,1906. sessi No. 310.327.

.lb all 'whom it may concern:

'Be it known that l, ABRAHAM B. LANDIS, a citizen of the United States, residin7 at Waynesboro, in the coun ty of vranklin and State et' Pennsylvania, have invented certain new and useful Improvements in Grinding-Machines, of which the following is a specification.

My said invention consists in certain improvements in the construction and arrangement oi grinding maf chines, particularly that class designed for grinding rolls, the improvements lconsisting in specific details of construction or enabling the machine to grind such work with a longitudinally slightly concaved or convex `surface, all as will be hereinafterl more fully described and claimed.

Referring to the accompanying drawings which are made a part hereoi and on which similar reference chai` aizters indicate similar parts, Figurel is a top or plank view oi a portion oi a grinding machine of my improved cfuistruction with the grinding wheel slider removed, fliig. 2 a side elevation of the same, Fig. 3 a cross-section through a grinding machine embodying said iinproveuients, and Fig. 4 a front elevation ol the central portion olf tho same with a part of the slide and slider broken away to show the internal mechanism. t

ln said drawings the portions marked A reprisent the bed of the machine, B the'work-holding table, C the grinding wheel carriage, D the slide on said grinding wheel carriage,. E the slider carrying the grindingwheel, and F the guide bar or track. These several parts ol the machine are or .inaybe ol the usual or any '-.tpju'ov,niate construction, `such as shown in sea/eral of my lormer patents, except in so far as relates toithe de tails which co istitute the improvements forming the subject .nnttter ol' this application.

A loading feature of said improvements is the bar F,

which is loi-ined with a. normally straight iront edge and mounted upon a central pivot boltf on a suitable part ol the bod A. Its ends are formed with transverse screw-threaded perforations, in which the inner screw threaded ,ends el transversely extending rods Ff are mounted. Said rods'extend through the side of the lied A to its outsidtgpat each end, where theyare provided with nuts f ulfpted to bear against washers f2 interposed between su' id nuts and the face oi' the bed A. Said washers]Z are formed with flanges and they are bolted to the bed A by bolts 3, and are' formed with recesses in their laces adjacent to the bed in which collars j, rigid on said rods li" operate, thus holding said rods trom longitudinal movement no matter which wziy they are turned. iront edge ol' said bur l" in an absolutely true line parallel with thf` work, and then, by continuing the turning thei'eol in one dirt-tation or tho other, said bar can be sprung to give its front edge either a slightly couvoxor a slightly concave loi-iu, longitudinally, the ends thoroi il being sprung either lorward or backward lroni the cen- Said rods l are first adjusted to bring lthe register, in order thats. uniform adjustment of both ends f of said bar may be determined with absolute accuracy, and then secured by an appropriate adjustment of the nuts. Said bar F thus furnishes a trackof either a straight or a curved form and is adapted to guide the slide" supporting the grinding wheel in its relation to the Work as the carriage travels back and forth. This is accomplished by the following mechanism: A rackbar D is mountedwithin a longitudinal recess in the slide .D by means of screw-bolts d which extend through longitudinal slots d/ in said bar and into screw-threaded perforations formed in the bottom of the slide beneath. Said rack-bar is thus adapted to have a limited longitudinal movement. A locking screw D2 is mounted in the outer end plate D3 of slide D and adapted to lock said rack-bar when grinding only straight Work by forcing said rack-bar against stud A coiled spring d2 mounted upon a stud d in the opposite end piece D4 of the slide D, is adapted to press against the adjacent end of said rack-bar and through the rack connection 'normally hold the roller d on crank arm d5 against said bar F. The rear edge oi said rack-bar rests solidly against anti-friction rollers D5 mounted upon short shafts or bolts d* set into screw-threaded perlorations in the bottom. of slide D, as shown. Said rack-bar is of considerable thickness as best shown in Figs. 2 and 4,

and the teeth extend across its entire Width. A vertical shaft D is journaled in bearings in the slide Dand has a crank ar1n d5 on its lower end with a crank-pin on its outer end having an anti-friction roller d thereon in position to run upon the front edge. of bar F when the rack-bar D is adapted to be under ayieldingengagement with the slide. Afpinion d7 onthe upper end of said crank shat Dn engages with the lower part of the face of the rack-bar D. A second shaft E/ is journaled in the slider E, passing up through the standard E2 and engaging in the usual way with a shaft E by which it may be operated to feed the slider E, carrying the grinding wheel W, t'o androin the Work. The lower end of said shaft Ef is provided with a pinion e adapted to engage with the upper side of the face of rack-bar D/ as shown in Figs. 2 and 4.

The operationis as follows: Whendt is desired to grind the work, such asa roll, with a slightly concave or convex surface longitudinally, the track bar F is sprung by means of the screw-rods F asvbelore described to give its iront odge the eoncavity or eonvexity required lor the degree of curv:.tti1ro desired intuire work. They rack-bar l)/ is loosened in its conuectios to the slide l) by releusingzserew D2. The pinion I7 and e of tho t-rank shalt D and tht` grinding whool, food sii-ait, il aro in ongagtinont, tliortwitli. Pho spring 1l2 holds' said ratlvliar il normally against', tlitpinion ti' and thor y tho i'oliot' Il against trai-lt liar l" hy which the ntovonionl, oi' tho slidrr is vontrolltd to prodnuo wither As tho grinding Wlioil ("arriago trai'orsos hat'li and forth (-:my-

ing tho slidot and tho grinding Whool ilioroon. tho

t work in a lino to oorrospontl with thev turvaturo of Said liar l". ily this moans tho stnt'aco of said work, which is ground Whil(x in rapid rotation. is givon tho desitod concavo ori'onvox form as will lio roadily understood. \\'hi1n is tlosirr-,tl to nso tho ,machina for grinding straight. work, st-t-st-row D2 is iorvod inward to slido tho ravir-har D against the inni-r ond of nin [3 and said liar is thus loi-,kwil in this position. This inoi'vmont will tarn tho crank rl with i-ho friction roller away from the migo oi liar F and thnaas said t'ait'iagil moi/0s hack and forth tho position ot' (iro grinding Wliiol in relation to thol work is not, oitoitod, lining tod forward as usual and hold in a fixed position' during tho trai/orso ot' said `(rari-tagt. by moans of tiro shat'tl and they iooding intrlxanisni connor-tod thorewith.

Haring thus inlly dvst'ribod iny l@aid invontion, what. 1 ilaitn as now and desire to scettro hy Lvttors Patent,

is:ML

1. in a grintiimnr innvhino. thu tl'onthination. with tin grinding wiwvi earring-gulf the slider mounted thvreon ami t-ontaning a movnhit ravit-har. the siidtr mounted on saidl siititanti car 'ving n shaft for moving; said slider had; and

fortli having; a pinion on its iowrr ond ongagini: with said` ravir-har, a crank-shaftA ionrnaltti in tht iiottom of saiti siido anti having: a pinion on its'upptlr ond tngaizing: with said rtttk-har amlna (trank on its lowtr and inrovtriod with an antidriction t'ollti' adaptvd to ongagtL with a track mounrori upon .thc tramo of thtinarhinoaand said track. substantially as sot forth.

U. in a` grinding indichino, tht` combination, of tho traino, t'ingrintiingarhiol rai-trigo, tho .siititr thorfzon hai-imr a longitudinal rr-ctss` a rack-har moitntod in saiti rocoss to moro iongitudinaiiy. tht: Hiidor iumtntud on said siititand having a shaft with a iiinion on its ion'vr ond vngagns: with said rack-har. a crank-shaft tnountod in tht` car izo with a pinion on its unina 0nd engaging with saiii rack-intr and crank on its iowor und havingY a part ongaging with :i track on tiatranio, and moans for curving-'said trat-li. loit-rittuiinally. stllistantiall) as sot forth.

:L in a grinding nmvhino. iinl combination. oi' tho trainttlu- :,frintiinflfwlutl tarriagt. the sltlty on said cnrrizipro. a rack-liar in said siido adapttti in "havo a limited movotnont. a sprint: i'or normally holding said ratk-har in ontl dirvi tion. tinl sith'r Contaninfar tht: t't-odini: shaft with a pinion ongauing with said ravit-har. a trranivshai't inonntvd in tht` vai-ritmo and having: a pinion ottima-'ing with said rat-Kimi' on its unimi' ond and a rrank on its io\\'tr und tlntzaginar with tlntrack in tho iranu-` and saii-trail consisting it a itat' pirotid. at its t'vntor and i-iiiiioitt-(l with adjusting; niithanisiu at nach ontl. "hortiiy saidontis inai' ho sprungY from said contrai pivot and lit-id in a iixtd position. :mitstantiaiiy as sot forth.

i in a grinding,niai-hino, tht minhination, of thv mrriago. tho siidt-r rai-aria;Y thtgrintiinp; whwi. a ratkliar in 

